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Note 17 - Segment Reporting - Segment Financial Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Revenue, Net |  | $ 51,219,000 |  | $ 62,383,000 |
Intercompany revenues |  |  |  |  |
Gross profit |  | 7,084,000 |  | 14,351,000 |
Research and Development Expense |  | 2,046,000 |  | 2,302,000 |
Interest income |  | 110,000 |  | 53,000 |
Interest expense |  | (489,000) |  | (489,000) |
Interest expense-financing fees |  | (108,000) |  | (228,000) |
Depreciation and amortization |  | 4,165,000 |  | 3,717,000 |
Segment (loss) income before income taxes |  | (16,257,000) |  | 480,000 |
Income Tax Expense (Benefit) |  | (2,994,000) |  | 543,000 |
Loss from continuing operations |  | (13,263,000) |  | (63,000) |
Segment assets(1) | [1] | 65,335,000 |  | 82,913,000 |
Expenditures for segment assets |  | 436,000 |  | 623,000 |
Total debt |  | 8,833,000 |  | 9,836,000 |
Treatment [Member] |  |  |  |  |
Revenue, Net |  | 32,253,000 |  | 41,318,000 |
Intercompany revenues |  | 40,000 |  | 113,000 |
Gross profit |  | 4,015,000 |  | 10,910,000 |
Research and Development Expense |  | 504,000 |  | 179,000 |
Interest income |  | 3,000 |  | 6,000 |
Interest expense |  | (29,000) |  | (38,000) |
Interest expense-financing fees |  |  |  | (2,000) |
Depreciation and amortization |  | 3,451,000 |  | 2,949,000 |
Segment (loss) income before income taxes |  | (10,119,000) | [2] | 7,101,000 |
Income Tax Expense (Benefit) |  | (3,013,000) | [2] | 538,000 |
Loss from continuing operations |  | (7,106,000) |  | 6,563,000 |
Segment assets(1) | [1] | 32,482,000 |  | 46,307,000 |
Expenditures for segment assets |  | 418,000 |  | 579,000 |
Total debt |  |  |  | 23,000 |
Services [Member] |  |  |  |  |
Revenue, Net |  | 18,966,000 |  | 21,065,000 |
Intercompany revenues |  | 28,000 |  | 25,000 |
Gross profit |  | 3,069,000 |  | 3,441,000 |
Research and Development Expense |  | 38,000 |  |  |
Interest income |  |  |  |  |
Interest expense |  | (2,000) |  |  |
Interest expense-financing fees |  |  |  |  |
Depreciation and amortization |  | 632,000 |  | 725,000 |
Segment (loss) income before income taxes |  | 744,000 |  | 1,178,000 |
Income Tax Expense (Benefit) |  |  |  |  |
Loss from continuing operations |  | 744,000 |  | 1,178,000 |
Segment assets(1) | [1] | 8,105,000 |  | 9,481,000 |
Expenditures for segment assets |  | 17,000 |  | 33,000 |
Total debt |  |  |  |  |
Medical [Member] |  |  |  |  |
Revenue, Net |  |  |  |  |
Intercompany revenues |  |  |  |  |
Gross profit |  |  |  |  |
Research and Development Expense |  | 1,489,000 |  | 2,114,000 |
Interest income |  |  |  |  |
Interest expense |  |  |  |  |
Interest expense-financing fees |  |  |  |  |
Depreciation and amortization |  |  |  |  |
Segment (loss) income before income taxes |  | (1,489,000) |  | (2,114,000) |
Income Tax Expense (Benefit) |  |  |  |  |
Loss from continuing operations |  | (1,489,000) |  | (2,114,000) |
Segment assets(1) | [1] | 382,000 |  | 1,793,000 |
Expenditures for segment assets |  | 1,000 |  |  |
Total debt |  |  |  |  |
Segments Total [Member] |  |  |  |  |
Revenue, Net | [3] | 51,219,000 |  | 62,383,000 |
Intercompany revenues |  | 68,000 |  | 138,000 |
Gross profit |  | 7,084,000 |  | 14,351,000 |
Research and Development Expense |  | 2,031,000 |  | 2,293,000 |
Interest income |  | 3,000 |  | 6,000 |
Interest expense |  | (31,000) |  | (38,000) |
Interest expense-financing fees |  |  |  | (2,000) |
Depreciation and amortization |  | 4,083,000 |  | 3,674,000 |
Segment (loss) income before income taxes |  | (10,864,000) |  | 6,165,000 |
Income Tax Expense (Benefit) |  | (3,013,000) |  | 538,000 |
Loss from continuing operations |  | (7,851,000) |  | 5,627,000 |
Segment assets(1) | [1] | 40,969,000 |  | 57,581,000 |
Expenditures for segment assets |  | 436,000 |  | 612,000 |
Total debt |  |  |  | 23,000 |
Corporate and Other [Member] |  |  |  |  |
Revenue, Net | [4] |  |  |  |
Intercompany revenues | [4] |  |  |  |
Gross profit | [4] |  |  |  |
Research and Development Expense | [4] | 15,000 |  | 9,000 |
Interest income | [4] | 107,000 |  | 47,000 |
Interest expense | [4] | (458,000) |  | (451,000) |
Interest expense-financing fees | [4] | (108,000) |  | (226,000) |
Depreciation and amortization | [4] | 82,000 |  | 43,000 |
Segment (loss) income before income taxes | [4] | (5,393,000) |  | (5,685,000) |
Income Tax Expense (Benefit) |  | 19,000 |  | 5,000 | [4]
Loss from continuing operations |  | (5,412,000) |  | (5,690,000) | [4]
Segment assets(1) | [1],[5] | 24,366,000 |  | 25,332,000 |
Expenditures for segment assets | [4] |  |  | 11,000 |
Total debt | [4],[6] | $ 8,833,000 |  | $ 9,813,000 |
[1] | Segment assets have been adjusted for intercompany accounts to reflect actual assets for each segment.
[2] | Amounts include tangible and intangible asset impairment losses of $1,816,000 and $8,288,000, respectively for the Company's M&EC subsidiary recorded in the second quarter of 2016 (see "Note 3 - M&EC Facility"). Also includes a tax benefit of approximately $3,203,000 recorded resulting from the intangible impairment loss recorded for our M&EC subsidiary.
[3] | The Company performed services relating to waste generated by the federal government, either directly as a prime contractor or indirectly for others as a subcontractor to the federal government, representing approximately $27,354,000 or 53.4% of total revenue from continuing operations during 2016 and $36,105,000 or 57.9% of total revenue from continuing operations during 2015. The following reflects such revenue generated by our two segments: 2016 2015 Treatment $ 21,434,000 $ 30,130,000 Services 5,920,000 5,975,000 Total $ 27,354,000 $ 36,105,000
[4] | Amounts reflect the activity for corporate headquarters not included in the segment information.
[5] | Amount includes assets from our discontinued operations of $434,000 and $565,000, as of December 31, 2016 and 2015, respectively.
[6] | Net of debt discount of ($0) and ($50,000) for 2016 and 2015, respectively, and net of debt issuance costs of ($151,000) and ($152,000) for 2016 and 2015, respectively (see "Note 10 - "Long-Term Debt" for additional information).

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